Pencil sharpener



FIG. 1 is a front and side perspective view of a pencil sharpener, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a side elevational view thereof; taken the side opposite that shown in FIG. 4;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view. 

The ornamental design for a pencil sharpener, as shown and described. 